Additional Examples

Metadata

You may want to pass dictionaries as arguments to your Cadence code. The most common is metadata with \{String:String\} type

_28

import {executeScript} from "@onflow/flow-js-testing"

_28

_28

const main = async () => {

_28

const basePath = path.resolve(__dirname, "../cadence")

_28

_28

// Init framework

_28

await init(basePath)

_28

// Start emulator

_28

await emulator.start()

_28

_28

const code = `

_28

pub fun main(metadata: {String: String}): String{

_28

return metadata["name"]!

_28

}

_28

`

_28

_28

// Define arguments we want to pass

_28

const args = [{name: "Boris", nickname: "The Blade"}]

_28

_28

// If something goes wrong with script execution, the method will throw an error

_28

// so we need to catch it and proce

_28

const [name, err] = await shallResolve(executeScript({code, args}))

_28

console.log(name, err)

_28

_28

await emulator.stop()

_28

}

_28

_28

main()

If you need to pass an array of dictionaries, it's not that different. Just replace the args variable above with multiple values:

_10

const args = [

_10

// This is array of dictionaries

_10

[

_10

{name: "Boris", nickname: "The Blade"},

_10

{name: "Franky", nickname: "Four-Fingers"},

_10

],

_10

]

Or maybe you want to pass dictionary with type {String: [String]}:

_10

const args = [

_10

{

_10

names: ["Alice", "Bob", "Charlie"],

_10

},

_10

]

Framework will try to resolve the types to the best of its abilities. If you encounter an error for your use case, please create an issue here: https://github.com/onflow/flow-js-testing/issues